/*
 * Copyright 2021 ThoughtWorks, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.thoughtworks.go.rackhack;

import com.thoughtworks.go.server.util.ServletHelper;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class DelegatingServlet extends HttpServlet {
    private HttpServlet rackServlet;
    private ServletHelper servletHelper;

    public DelegatingServlet() {
    }

    @Override
    public void init(ServletConfig config) throws ServletException {
        rackServlet = (HttpServlet) config.getServletContext().getAttribute(DelegatingListener.DELEGATE_SERVLET);
        rackServlet.init(config);
        servletHelper = ServletHelper.getInstance();
    }

    @Override
    public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String url = request.getRequestURI().replaceAll("^/go/rails/", "/go/");
        servletHelper.getRequest(request).setRequestURI(url);
        rackServlet.service(request, response);
    }

    @Override
    public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException {
        service((HttpServletRequest) request, (HttpServletResponse) response);
    }
}
